Method of promoting plasticity of mortar materials



W. W. RHODES. METHOD OF PROMOTING PLASIICITY 0F MORTAR MATERIALS. APPLICATION men SEPTQZI. 1916.

1,318,922. Patented Oct. 14,1919.

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ME OD eF geo cTm-e m ma? orivionran mean n s;- p f To all whomvit may concern.-

Be it known that LWILLLIAMWV. Rrionns', a citizen of the United States of A m'eric'a,

residing at W obdvi'lle, Sandusky county, Ohio-,- have invented new and useful Methods of Promoting Plasticity oflvlortar Materials, of which'the following is'a specification; r p This invention' relates to the densifica tion of subdivided materials and the vacuum treatment thereofv 5;; "lhis'inv'enti0n hasutility in connection with alkaline hydrates, especially of' the alkalineearth group, as calcium or iiiagii l l man and less porosity. The duration of treatment and theseverity thereof may be adjusted to meet containing substances,- producing a more dense dry material, and with added moisture increasing its plasticity, as well as improving its texture of smoothness in working up with Water and using as a plaster or wall finish. In the instance of calcium hydrate and magnesium hydrate as herein manufactured, with water and associated desired substances, there may be produced a wall finish applicable to result in increased density face for the Wall, less open and less liable to check. There is the furthercommercial advantage that this hydrateis of less bulk, and of increased specific gravity. This bulk reduction may be as much as 22% with a vacuum of 13 c. m. Hg. This bulk reduction has been tested out With' several wall finish products from various'quarries.

In theoperation hereunder, the material to be treated is normally takenin the sub-. divided state and its envelopingatmosphere rarefied. This may occur when the material is being tempered or. seasoned by Water.

with the material in a quiescent state in areceiver, which receiver may be air tight and have thepressure-reduced therein- The material calcined, hydrated and ground, .or1

V luniformly sub-divided, may be acted upon hereunder before sacking or packaging, thus reducing the container volume for a given weight, substantiating the theory that by this treatment a removal of a. larger or smaller portion of air fromthe'm'ass allows the particles to settle more closely together.

This'material is accordingly eifectively"i1 nproved in its. condition by the treatment, independent ofmanipulation or pressure 7 compacting thereof. This treatmentmay occur for the extraction of airor the inactive fluid from the hydrate or other sub-divided material associated or isolated. The

Specification of Letters Pat ent.v Application filed September 271 1916." Seria1 No'. 12 2;3'67. i

association .inay be in amiXture especially combined for commercial purposes:

ny event; if therebe -Qnot the actual thamhe worked-up material seemstohave V a greater smoothness thus it is more readoplicable "in a "I'nass',"joint brfiriisli fo'r- 011,111 taking a set of greater strength the conditions as may be found most advantageous in the variations normally confronting the sociated from the mass which apparently tended to isolate the particles thereby result.

ing, without the application of pressure, in

an automatic compacting of the mass tojgive it reduced volume in thisloose' powdered state. This 1s a direct extraction of air from a previously dry mass and leaves par ticles free to settle against each. other, ad-

. vantageous in that the same-weight maybe handledin less size containers. Furthermore, this leaves the part1cles more suscep,

tible for. Water taking up in the use ofma. r

terial asin' mortar. Less Water is necessary- 1n the mortar'mlxlng'. The resulting paste is more smooth and the finished Wall is of improved density and firmness. V i

In the carrying out of the'inven'tion an apparatus may be used as disclosed in the. accompanying. drawings; v V Y V Figure l is a'fiagmentary showing inside elevation-of a charging cylinder or lret'ort with a tray loaded "car therein; 7 r 1 F g12 1s an end elevationofthe cylinder material carrying trays to be loaded on the J car.

i055 and car of Fig. 1, parts being broken} away; i

The charging cylinder 1- may have its ends closed by the packed and removable heads 2 in order that the tracks 3 may have rolled thereon the cars a carrying the trays 5 With a more or less thinly distributed layer of the material to be acted upon. The trays 5 in their stacking on the cars 4, have the interlitting legs 6, spacing the trays so there may be free air circulation over the material in the trays. The cylinder 1 may be charged With cars of material carrying trays, the loose material on the trays being say lime hydrate for compacting. The heads 2 are clamped in position, and the vacuum pump 7 operated to reduce the pressure in the cylinder, 1. r

The various factors ofcharacter ofmaterial, duration of treatment and extent of vacuum, each enter into consideration in letermining procedure hereunder. WVith dry hydrate of lime spread out in approximately sixinch layers'and subjected to, a pressure tar and plaster uses, and imparting to such treated hydrate when such hydrate is Worked into mortar or plaster an increased plasticity, said treatment comprising the removal of air from the dry hydrate While said hydrate is in a pulverulent state, and settling down the subdivided particles havingthe air removed there-from to produce a compacted mass of reduced volume r In Witness whereof I afiix my signature. WILLIAM V; RHODES.

Copies of this patent may be obtained for five cents each, by addressingfthe Commissioner of Patents, Washington, D. G. 

